SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The isochronous buffering scheme allows each ping or pong buffer to contain a single block or a multiple number of blocks. For this reason, the isochronous buffer depth (BDi) must be defined in terms of an integer number (n) and block size (BS) (that is, BDi = n × (BS + 1) - 1).
Table 26-1638 shows the format for an isochronous DMA descriptor table entry. For more details about the field descriptions see Table 26-1636. Each isochronous channel buffer can be up to 8k-bytes deep.
Bit Offset | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0 | CE | LE | PG | Reserved | ||||||||||||
16 | Reserved | |||||||||||||||
32 | RDY1 | DNE1 | ERR1 | BD1[12:0] | ||||||||||||
48 | RDY2 | DNE2 | ERR2 | BD2[12:0] | ||||||||||||
64 | BA1[15:0] | |||||||||||||||
80 | BA1[31:16] | |||||||||||||||
96 | BA2[15:0] | |||||||||||||||
112 | BA2[31:16] |